biology (combined)

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variation

enviromental causes of variation

  • animals and plants can be affected by climate, diet, accidents, culture and lifestyle
  • natural selection- organisms better adapted to enviroment are more likely to survive and have more offspring meaning its passed on.

evolution

  •  how things have evolved overtime.
  • natural selection-  theres a wide range of variation. individuals with characteristics more suited to the enviroment are more likely to survive and reproduce all others are killed off meaning the ones with the best…

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